Moon dust that astronaut Neil Armstrong collected during 1969’s Apollo 11 mission that was man’s first visit to the moon could sell for a seven-figure sum at auction in April – years after the space agency fought in court to keep the dust out of private hands.

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Armstrong collected the dust as a contingency sample shortly after he took his first steps on the lunar surface and uttered his now-famous line, “that’s one small step for mana giant leap for mankind,” auction house Bonhams said.

The dust is expected to sell for between $800,000 and $1.2 million, according to Bonhams.

The lunar bag that contained it – and included only particles of lunar material left in the bag – was auctioned off in 2017 for $1.8 million,

A portion of the proceeds will go toward scientific charities, Bonham’s said.

The lunar dust will be sold April 13 as part of a space-themed auction that also includes a fragment of Sputnik 1the first space satellite ever launched.